export function createPath() {
  // Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
  let exports = {}

  var _process;
  if(typeof process === 'undefined') {
    _process = {
      env: {},
      cwd: function() {
        return (typeof window !== 'undefined' && window.location.pathname) || "";
      }
    };
  }else {
    _process = process;
  }

  var isWindows = false && (_process.platform === 'win32');

  function isString(obj) {
    return typeof obj === 'string';
  }


// resolves . and .. elements in a path array with directory names there
// must be no slashes, empty elements, or device names (c:\) in the array
// (so also no leading and trailing slashes - it does not distinguish
// relative and absolute paths)
  function normalizeArray(parts, allowAboveRoot) {
    // if the path tries to go above the root, `up` ends up > 0
    var up = 0;
    for (var i = parts.length - 1; i >= 0; i--) {
      var last = parts[i];
      if (last === '.') {
        parts.splice(i, 1);
      } else if (last === '..') {
        parts.splice(i, 1);
        up++;
      } else if (up) {
        parts.splice(i, 1);
        up--;
      }
    }

    // if the path is allowed to go above the root, restore leading ..s
    if (allowAboveRoot) {
      for (; up--; up) {
        parts.unshift('..');
      }
    }

    return parts;
  }


  if (isWindows) {
    // Regex to split a windows path into three parts: [*, device, slash,
    // tail] windows-only
    var splitDeviceRe =
      /^([a-zA-Z]:|[\\\/]{2}[^\\\/]+[\\\/]+[^\\\/]+)?([\\\/])?([\s\S]*?)$/;

    // Regex to split the tail part of the above into [*, dir, basename, ext]
    var splitTailRe =
      /^([\s\S]*?)((?:\.{1,2}|[^\\\/]+?|)(\.[^.\/\\]*|))(?:[\\\/]*)$/;

    // Function to split a filename into [root, dir, basename, ext]
    // windows version
    var splitPath = function(filename) {
      // Separate device+slash from tail
      var result = splitDeviceRe.exec(filename),
        device = (result[1] || '') + (result[2] || ''),
        tail = result[3] || '';
      // Split the tail into dir, basename and extension
      var result2 = splitTailRe.exec(tail),
        dir = result2[1],
        basename = result2[2],
        ext = result2[3];
      return [device, dir, basename, ext];
    };

    var normalizeUNCRoot = function(device) {
      return '\\\\' + device.replace(/^[\\\/]+/, '').replace(/[\\\/]+/g, '\\');
    };

    // path.resolve([from ...], to)
    // windows version
    exports.resolve = function() {
      var resolvedDevice = '',
        resolvedTail = '',
        resolvedAbsolute = false;

      for (var i = arguments.length - 1; i >= -1; i--) {
        var path;
        if (i >= 0) {
          path = arguments[i];
        } else if (!resolvedDevice) {
          path = _process.cwd();
        } else {
          // Windows has the concept of drive-specific current working
          // directories. If we've resolved a drive letter but not yet an
          // absolute path, get cwd for that drive. We're sure the device is not
          // an unc path at this points, because unc paths are always absolute.
          path = _process.env['=' + resolvedDevice];
          // Verify that a drive-local cwd was found and that it actually points
          // to our drive. If not, default to the drive's root.
          if (!path || path.substr(0, 3).toLowerCase() !==
            resolvedDevice.toLowerCase() + '\\') {
            path = resolvedDevice + '\\';
          }
        }

        // Skip empty and invalid entries
        if (!isString(path)) {
          throw new TypeError('Arguments to path.resolve must be strings');
        } else if (!path) {
          continue;
        }

        var result = splitDeviceRe.exec(path),
          device = result[1] || '',
          isUnc = device && device.charAt(1) !== ':',
          isAbsolute = exports.isAbsolute(path),
          tail = result[3];

        if (device &&
          resolvedDevice &&
          device.toLowerCase() !== resolvedDevice.toLowerCase()) {
          // This path points to another device so it is not applicable
          continue;
        }

        if (!resolvedDevice) {
          resolvedDevice = device;
        }
        if (!resolvedAbsolute) {
          resolvedTail = tail + '\\' + resolvedTail;
          resolvedAbsolute = isAbsolute;
        }

        if (resolvedDevice && resolvedAbsolute) {
          break;
        }
      }

      // Convert slashes to backslashes when `resolvedDevice` points to an UNC
      // root. Also squash multiple slashes into a single one where appropriate.
      if (isUnc) {
        resolvedDevice = normalizeUNCRoot(resolvedDevice);
      }

      // At this point the path should be resolved to a full absolute path,
      // but handle relative paths to be safe (might happen when process.cwd()
      // fails)

      // Normalize the tail path

      function f(p) {
        return !!p;
      }

      resolvedTail = normalizeArray(resolvedTail.split(/[\\\/]+/).filter(f),
        !resolvedAbsolute).join('\\');

      return (resolvedDevice + (resolvedAbsolute ? '\\' : '') + resolvedTail) ||
        '.';
    };

    // windows version
    exports.normalize = function(path) {
      var result = splitDeviceRe.exec(path),
        device = result[1] || '',
        isUnc = device && device.charAt(1) !== ':',
        isAbsolute = exports.isAbsolute(path),
        tail = result[3],
        trailingSlash = /[\\\/]$/.test(tail);

      // If device is a drive letter, we'll normalize to lower case.
      if (device && device.charAt(1) === ':') {
        device = device[0].toLowerCase() + device.substr(1);
      }

      // Normalize the tail path
      tail = normalizeArray(tail.split(/[\\\/]+/).filter(function(p) {
        return !!p;
      }), !isAbsolute).join('\\');

      if (!tail && !isAbsolute) {
        tail = '.';
      }
      if (tail && trailingSlash) {
        tail += '\\';
      }

      // Convert slashes to backslashes when `device` points to an UNC root.
      // Also squash multiple slashes into a single one where appropriate.
      if (isUnc) {
        device = normalizeUNCRoot(device);
      }

      return device + (isAbsolute ? '\\' : '') + tail;
    };

    // windows version
    exports.isAbsolute = function(path) {
      var result = splitDeviceRe.exec(path),
        device = result[1] || '',
        isUnc = device && device.charAt(1) !== ':';
      // UNC paths are always absolute
      return !!result[2] || isUnc;
    };

    // windows version
    exports.join = function() {
      function f(p) {
        if (!isString(p)) {
          throw new TypeError('Arguments to path.join must be strings');
        }
        return p;
      }

      var paths = Array.prototype.filter.call(arguments, f);
      var joined = paths.join('\\');

      // Make sure that the joined path doesn't start with two slashes, because
      // normalize() will mistake it for an UNC path then.
      //
      // This step is skipped when it is very clear that the user actually
      // intended to point at an UNC path. This is assumed when the first
      // non-empty string arguments starts with exactly two slashes followed by
      // at least one more non-slash character.
      //
      // Note that for normalize() to treat a path as an UNC path it needs to
      // have at least 2 components, so we don't filter for that here.
      // This means that the user can use join to construct UNC paths from
      // a server name and a share name; for example:
      //   path.join('//server', 'share') -> '\\\\server\\share\')
      if (!/^[\\\/]{2}[^\\\/]/.test(paths[0])) {
        joined = joined.replace(/^[\\\/]{2,}/, '\\');
      }

      return exports.normalize(joined);
    };

    // path.relative(from, to)
    // it will solve the relative path from 'from' to 'to', for instance:
    // from = 'C:\\orandea\\test\\aaa'
    // to = 'C:\\orandea\\impl\\bbb'
    // The output of the function should be: '..\\..\\impl\\bbb'
    // windows version
    exports.relative = function(from, to) {
      from = exports.resolve(from);
      to = exports.resolve(to);

      // windows is not case sensitive
      var lowerFrom = from.toLowerCase();
      var lowerTo = to.toLowerCase();

      function trim(arr) {
        var start = 0;
        for (; start < arr.length; start++) {
          if (arr[start] !== '') break;
        }

        var end = arr.length - 1;
        for (; end >= 0; end--) {
          if (arr[end] !== '') break;
        }

        if (start > end) return [];
        return arr.slice(start, end - start + 1);
      }

      var toParts = trim(to.split('\\'));

      var lowerFromParts = trim(lowerFrom.split('\\'));
      var lowerToParts = trim(lowerTo.split('\\'));

      var length = Math.min(lowerFromParts.length, lowerToParts.length);
      var samePartsLength = length;
      for (var i = 0; i < length; i++) {
        if (lowerFromParts[i] !== lowerToParts[i]) {
          samePartsLength = i;
          break;
        }
      }

      if (samePartsLength == 0) {
        return to;
      }

      var outputParts = [];
      for (var i = samePartsLength; i < lowerFromParts.length; i++) {
        outputParts.push('..');
      }

      outputParts = outputParts.concat(toParts.slice(samePartsLength));

      return outputParts.join('\\');
    };

    exports.sep = '\\';
    exports.delimiter = ';';

  } else /* posix */ {

    // Split a filename into [root, dir, basename, ext], unix version
    // 'root' is just a slash, or nothing.
    var splitPathRe =
      /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
    var splitPath = function(filename) {
      return splitPathRe.exec(filename).slice(1);
    };

    // path.resolve([from ...], to)
    // posix version
    exports.resolve = function() {
      var resolvedPath = '',
        resolvedAbsolute = false;

      for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
        var path = (i >= 0) ? arguments[i] : _process.cwd();
        // Skip empty and invalid entries
        if (!isString(path)) {
          throw new TypeError('Arguments to path.resolve must be strings');
        } else if (!path) {
          continue;
        }

        resolvedPath = path + '/' + resolvedPath;
        resolvedAbsolute = path.charAt(0) === '/';
      }

      // At this point the path should be resolved to a full absolute path, but
      // handle relative paths to be safe (might happen when process.cwd() fails)

      // Normalize the path
      resolvedPath = normalizeArray(resolvedPath.split('/').filter(function(p) {
        return !!p;
      }), !resolvedAbsolute).join('/');

      return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
    };

    // path.normalize(path)
    // posix version
    exports.normalize = function(path) {
      var isAbsolute = exports.isAbsolute(path),
        trailingSlash = path[path.length - 1] === '/',
        segments = path.split('/'),
        nonEmptySegments = [];

      // Normalize the path
      for (var i = 0; i < segments.length; i++) {
        if (segments[i]) {
          nonEmptySegments.push(segments[i]);
        }
      }
      path = normalizeArray(nonEmptySegments, !isAbsolute).join('/');

      if (!path && !isAbsolute) {
        path = '.';
      }
      if (path && trailingSlash) {
        path += '/';
      }

      return (isAbsolute ? '/' : '') + path;
    };

    // posix version
    exports.isAbsolute = function(path) {
      return path.charAt(0) === '/';
    };

    // posix version
    exports.join = function() {
      var path = '';
      for (var i = 0; i < arguments.length; i++) {
        var segment = arguments[i];
        if (!isString(segment)) {
          throw new TypeError('Arguments to path.join must be strings');
        }
        if (segment) {
          if (!path) {
            path += segment;
          } else {
            path += '/' + segment;
          }
        }
      }
      return exports.normalize(path);
    };


    // path.relative(from, to)
    // posix version
    exports.relative = function(from, to) {
      from = exports.resolve(from).substr(1);
      to = exports.resolve(to).substr(1);

      function trim(arr) {
        var start = 0;
        for (; start < arr.length; start++) {
          if (arr[start] !== '') break;
        }

        var end = arr.length - 1;
        for (; end >= 0; end--) {
          if (arr[end] !== '') break;
        }

        if (start > end) return [];
        return arr.slice(start, end - start + 1);
      }

      var fromParts = trim(from.split('/'));
      var toParts = trim(to.split('/'));

      var length = Math.min(fromParts.length, toParts.length);
      var samePartsLength = length;
      for (var i = 0; i < length; i++) {
        if (fromParts[i] !== toParts[i]) {
          samePartsLength = i;
          break;
        }
      }

      var outputParts = [];
      for (var i = samePartsLength; i < fromParts.length; i++) {
        outputParts.push('..');
      }

      outputParts = outputParts.concat(toParts.slice(samePartsLength));

      return outputParts.join('/');
    };

    exports.sep = '/';
    exports.delimiter = ':';
  }

  exports.dirname = function(path) {
    var result = splitPath(path),
      root = result[0],
      dir = result[1];

    if (!root && !dir) {
      // No dirname whatsoever
      return '.';
    }

    if (dir) {
      // It has a dirname, strip trailing slash
      dir = dir.substr(0, dir.length - 1);
    }

    return root + dir;
  };


  exports.basename = function(path, ext) {
    var f = splitPath(path)[2];
    // TODO: make this comparison case-insensitive on windows?
    if (ext && f.substr(f.length - ext.length) === ext) {
      f = f.substr(0, f.length - ext.length);
    }
    return f;
  };


  exports.extname = function(path) {
    return splitPath(path)[3];
  };



  if (isWindows) {
    exports._makeLong = function(path) {
      // Note: this will *probably* throw somewhere.
      if (!isString(path))
        return path;

      if (!path) {
        return '';
      }

      var resolvedPath = exports.resolve(path);

      if (/^[a-zA-Z]\:\\/.test(resolvedPath)) {
        // path is local filesystem path, which needs to be converted
        // to long UNC path.
        return '\\\\?\\' + resolvedPath;
      } else if (/^\\\\[^?.]/.test(resolvedPath)) {
        // path is network UNC path, which needs to be converted
        // to long UNC path.
        return '\\\\?\\UNC\\' + resolvedPath.substring(2);
      }

      return path;
    };
  } else {
    exports._makeLong = function(path) {
      return path;
    };
  }

  return exports
}
